重要的是，这个研究完成样本小，非随机抽样，并且不是广义的或者建议可以预防受伤的项目。
It is important to note that this study was completed on a small, non-randomized sample, and may not be generalized or suggest this program can prevent injury.
方法采用非概率随机抽样方法，选取283户家庭进行调查，并对调查结果进行统计、分析。
METHODS: a total of 283 families were investigated by random sampling, and the results of investigation were analyzed statistically.
方法采用整群分层随机抽样的方法，对吉林市某医学院校及非医学高校的在校大学生进行问卷调查。
Methods With the method of cluster stratified random sampling, a questionnaire survey was conducted in medical and non-medical higher-educated school in Jilin city.
研究对象为随机抽样选定的大连水产学院二年级非英语专业的大学生。
The subjects were randomly chosen from the sophomores from different majors who studying English as their second language in Dalian Fisheries University.
方法：简单随机抽样问卷调查和非结构式访谈。
Method: Using simple random sampling survey and non-structured interviews.
方法：简单随机抽样问卷调查和非结构式访谈。
Method: Using simple random sampling survey and non-structured interviews.
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